Sheet-supplying device for printing machines



July v19, 1932. A BTTNER 1,868,381

SHEET SUPPLYING DEVICE FOR PRINTING MACHINES Filed Feb. 17, 1931 2sheets-sheet 1 July 19, 1932. A. BUTTNER SHEET SUPPLYIG DEVICE FORPRINTING MACHINES Filed Feb. 17, 1951 2 Sheets-Sheet 2 Patented Jul'y19, 1932 Vunirse STATES PATENT cerros illvi'WIR,l BTTNER, OF HEIDELBERG,GERMANY, ASSIGNOR TO SCHNELLPRESSEN- FABRIK AKTIENGESELLSCHAFTHEIDELBERG, F HEIDELBERG, GERMANY vSHEE'l-SUIPPLYING DEVICE FOR PRINTINGMACHINES Application led February 17', 1931, Serial No.

This invention relates to a sheet supplying device for printing machinesand the like of that type in which the sheet to be printed is .conductedalong over a laying-on table by means of suckers.

With the known sheet-supplying devices of this type, there is arrangedacross the laying-on table a sucker rod which can slide in guidesprovided at both sides of said table,

and is, besides, connected at each table side with an endless band-guidein order tobe moved along to and fro over the said table. A drawback ofthat known arrangement and combination of parts consists therein thatseparate driving devices must be provided for every endless band, andmust extend upwardly to the laying-on table. Owing to that arrangementthis table is not freely accessible; it is, however, often timesnecessary to lay on the sheets manually. The sucker -Yr'od mustA in thiscase either be disconnected from the driving mechanism provided for itor must be removed from the machine together with that mechanism.

Another drawback of the known arrangement is this that by the sucker rodwhich is moved to and fro over the laying-on table and by said drivingmechanism the person attending to the machine can easily be hurt. Thedrawbacks mentioned are overcome by the present invention, thesubject-matter of which consists therein that the sucker rod can beshifted rectilinearly below the layingon table, and that the plate ofthis table is provided with longitudinal slots into which the suckersextend in order to act on the sheet at the lower surface thereof. Thereare, thus, above the table no reciprocating parts likely to hurt theperson attending to the machine, and besides, the table is continuallyfree for laying-on the sheets also ,nanually. The sucking action of thesuckers running to and fro below the table can be interrupted by turningonly one handle.

With printing machines in which the rotating impression cylinder and thecomposition bed are moved counter to one another, the sucker rodarranged below the layingon table can be connected with the impressioncylinder easily in such a manner that 516,425, and in Germany February25, 1930.

it takes part in the to-and-fro movement of said cylinder whereby aseparate driving mechanism can be dispensed with.

The invention is illustrated diagrammatically and by way of example onthe accomy155 panying drawings on which Figure l is a sideview of theparts concerned of a printing machine having a reversely movableimpression cylinder and bed; Figure 2 is a transverse section in trieplane -I of Fig. l, and Figure 3 is a plan of a. part of the laying-ontable.

Immediately at the laying-on pile l a frame 20 is secured to the frame6; the large opening formed by this frame is covered with a plate dconsisting of a non-electric material. Below this plate is a sucker rod3 which can be moved to and fro upon longitudinal guides 7, and to whichare attached a plurality of suckers 31, the nozzles 32 of which extendinto longitudinal slots 41 of the plate 4, but do not extend above theupper surface thereof.

rlhe sucker rod 3 is engaged by rods 8, the other ends of which areconnected with levers 9 aiiixed to a shaft l0 supported in the lateralparts ll of the impression cylinder. Said parts ll are reciprocated inknown manner together with the impression cylinder reversely Withrespect to the bed of the machine. As the length of way of thisreciproeating motion is shorter than the length of way requisite forconveying the sheet to the laying-on marks there is arranged in thecogwheel 22 which is connected with the impression cylinder aspirally-shaped cam way l2 which is engaged by a roll 28 secured to thelever 9 whereby the two lever 9 and, thus, also the sucker bar 3receives an additional movement when the impression cylinder will bemoved to and fro, the length of that additional way being such isrequisite to attain the complete length of way yfor the sheets.

The'suckers 31 are arranged upon the sucker rod 3 in such a manner thateven sheets of the smallest size occurring in practice are gripped byall suckers. In order to prevent the longitudinal side parts of largesheets from fluttering upwardly removable and adi justable coveringrakes 13l are provided overI the frame 6 and are supported in brackets24 located upon said frame.

With the arrangement and combination of 'parts described the sucker rod2 takes a sheet frointhe laying-on pile l and lifts it over the suckers31 to and upon the laying-on table. The vacuum to the suckers is theninterrupted so that the sucking actionvceases, and ino stantlythereafter a pressure below atmosedge ofthe tableV plate 4 to thelaying-on pheric pressure is producedin the flexible pipe 16 (which isconnected with an air pump) so that the suckers'suck onthe sheet whichnow is conveyed parallel to the upper marks 5. @wing tothe use of anon-electric material for the covering plate 4l electric impedimentstothe movement of the sheet are prevented.

, As soon as the front of the sheet arrives at the laying-on marks 5,the reduced pres-A surein the suckers 5 is broken and is switched on tosuckers lll, thecorilices of which lie in the plate 4:' directly infront of the layingon marks 5 (Figs. 2 and 8).V The sheet is Anowin aquiet position and is then straightened in that the lateral markshoves'it a little inwardly, and simultaneously therewith the laying-onmarks are moved rearwardly'by say 5 mm. so that they shovevback thesheet. Hereby is attained that slight yinaccuracies in the sheetguidance-are equalized in forward direction.

I claim:

machines, comprising, in combination with a laying-on table and withsuckers adapted to convey the sheets along over said table, a sucker rodto which said suckers are attached and which is arranged below the saidtable l. A sheet-supplying device for-printing and adapted to beshiftedrectilinearly below it; a plate forming the uppermost part of thelaying-on table and consisting of a nonelectric material and havinglongitudinal slots,`the said suckers extending'into these slots, for thepurpose set forth. Y .f

` 2. A Vsheet-supplying device for printing machines, comprising, incombination with a laying-oli table, conveying suckers for-the sheets,and :suckers adapted to retain the y .sheets temporarily after havingbeen conveyed by the first-mentioned suckers a sucker rod to which saidsuckers are attached and which is arranged below the said table andadapted to be shifted rectilinearly below it; a plate forming theuppermost part of the laying-on table and having longitudinal slots,the'said suckers extending into theseV slots, for Vthe purpose setforth. i

Y 3. A sheet supplying device forprinting machines, comprising, incombination with 'y impression members moved counter to one another,alaying-on table, and suckers adapted to convey the sheets along oversaid table, a sucker rod -to which said suckers arcat-

